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  #1 (permalink)  
Old 08-30-2019, 05:10 PM
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Keep killing batteries

I have just recently finished my CFL build. Ran into a little issue, I have only ridden 3 times since I finished for a total of maybe 50 miles. Well today I rode to work and went to start it to come home and the battery was dead. This was a brand new AGM battery, and I have done all the test, and still cant seem to find the cause. Flash back to 3 years ago the same bike left me stranded twice with dead batteries. The charging system has been changed, the bike has been completely rewired. I have noticed that the mount for the battery does not completely tighten down, it just bends and wont hold the battery tight. My question is this, Have any of you guys had issues with the vibrations just beating the battery to death? This is the only thing I can think of that might be causing the issue. Its sad I really like this bike, but im afraid to ride because it has left me stranded 3 times so far.
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  #2 (permalink)  
Old 08-30-2019, 06:18 PM
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Quote:
Originally Posted by Nitroearl View Post
I have just recently finished my CFL build. Ran into a little issue, I have only ridden 3 times since I finished for a total of maybe 50 miles. Well today I rode to work and went to start it to come home and the battery was dead. This was a brand new AGM battery, and I have done all the test, and still cant seem to find the cause. Flash back to 3 years ago the same bike left me stranded twice with dead batteries. The charging system has been changed, the bike has been completely rewired. I have noticed that the mount for the battery does not completely tighten down, it just bends and wont hold the battery tight. My question is this, Have any of you guys had issues with the vibrations just beating the battery to death? This is the only thing I can think of that might be causing the issue. Its sad I really like this bike, but im afraid to ride because it has left me stranded 3 times so far.
Doubt vibration, but sill , a battery should be sitting on a mat , well tied down. 1) I hear you about charging fixes, bu it still might be an issue- no charging and you ran on battery. And then , can,t start. Easy on test by jus simply placing voltmeter on the battery posts while the bike is running . 13-14 volts is normal charging.. Or 2) when parked , could be draining somewhere, an error of wiring. You can disconnect negative cable from battery, place ampermeter in-line and check if there,s current with the ignition key off. Thee should be none.
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Last edited by STEINBVG; 08-30-2019 at 06:52 PM..
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Old 08-30-2019, 06:24 PM
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What are the results of the tests you performed, DC voltage at battery and AC voltage coming out of the stator?
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Old 08-30-2019, 07:14 PM
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Yes sir, as I stated in my recent post, I have been through two of those things this year, and It is very possible that heat and vibration can shake them apart, that's why I went back to the Lithium ...I would do that simple test that Stein described, and if it checks ok, then you may have to do the same..people are having good luck from the Lithiums' from the input I received.

First, see if it will charge back with your floor charger, if yes, then check charging system, if no then garbage...
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Last edited by Shovel52; 08-30-2019 at 07:17 PM..
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Old 08-30-2019, 07:18 PM
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I havent been able to do the test, bike is still at work and need to get a new battery. The issue is not the battery losing charge, it is the battery is dead. It wont pass a load test, dead. Thats why I am leaning toward more of vibration just bearing the cells to death. Once i get the bike back home I will do the test once again.

Yes, the battery is sitting on top of a rubber mat.
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Old 08-31-2019, 08:17 PM
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I’d look at the ground on the regulator. If the reg is not grounded it cannot dump off the excess charge and could be killing the battery. Just a shot in the dark.
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  #7 (permalink)  
Old 09-01-2019, 08:11 PM
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My first assumption would be that the battery is getting fried as Pushrod says.
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  #8 (permalink)  
Old 09-25-2019, 04:23 PM
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Well guys I was so pissed off with my bike I just recently messed with it. I took the battery to get tested and it was fine. It seems the battery just lost the charge trying to turn over the big ass motor. After banging my head against the wall for a few days trying to get the damn thing to start I finally found out the plugs had fouled out. So now Im on the mission to find out why I fouled plugs. I am thinking it has something to do with the settings on the ignition. It is a new one. Anyway one I got it started I did all the checks just to make sure it wasnt the charging system. Here is what I got.

Stator reads .4 ohms
Dc Voltage while running was 13.6 at battery.
Ac voltage coming out of stator was 20-21 at idle and 45-46 when revved up. Dont have a tach so not exactly sure of the rpm.

Now that have gotten it all running again, I left it off the tender for a few days. Went to start it and it fired right up, so the battery is not draining down. It looks like all these issues this time were from fouled out plugs.
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Old 10-04-2019, 06:16 AM
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Back in the day when I finished my chopper, I resp. my bike killed 2 batteries in 6 months. Ok the first one was not completely new, but the second one. At the battery shop they told me the voltage was still ok but the "cold start" (sorry I speak German) was down. Probably the bike killed the battery becuase of heat from the oiltank (next to it) and vibrations.

I made some isolation to the oiltank and elastic rubber mat for the battery to sit on and made sure it is not moving. Since then I had no more problems.

But anyway, I switched to a lithium battery. It is lighter, has more power and lasts longer.
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